Nut-lock.



M. AGKERMAN.

I NUT LOCK. APPLICATION FILED AUG- 8,1913.

Patented Sept. 15, 1914.

WITNESS S 0.. WASHINGTON l.)v Cv @FFTCE.

MAURICE ricnnnivrnnjorwasniiveron, nrsriarctr or oonuiunrn, .assrenon onTWO- FIFTHS TO SAMUELTKBUQGFF, OF WASHINGTON, DISTRIGJ. OF COLUMBIA.

intense.

To all whomt't may concern.

Be it known that I, MAURICE AOKERMAN, a subject of the King of GreatBritain, residing at lVashington, in the Districtof Columbia, haveinvented a certain new and useful Improvement in Nut-Locks, of which thefollowing is a full, clear, and exact description.

This invention relates to the type of nutlocks in which an added elementengages both the nut and the bolt to prevent the nut from accidentallyrunning oil the bolt and also frombeing surreptitiously removed.

The invention consists of a nut lock in which the nut is made with anundercut, smooth surfaced groove in its outer portion and surroundingitsthreaded bore, and carrying a spring dogging device, and the bolt ismade with a longitudinal slit to receive the spring dogging device,which engages the smooth surface of the groove andthereby preventsretrograde movement of the nut and yet allows ofits constant advance,and which, by a suitable tool, may be disengaged so as to permit the nutto be run off of the bolt whenever desired; the nut and dogging devicebeing capable of being used over and over again, all as I will proceednow to explain and finally claim.

In the accompanying drawings, illustra-ting my invention, in the severalfigures of which like parts are similarly designated, Figure 1 is aperspective view of a rail joint with one of my nut-locks in place. Fig.2 is a cross-section of the nut and dog therein. Fig. 3 is anelevationof the bolt.

Fig. 4 is a top view of the nut. ,Fig. 5 is a top view of the bolt. Fig.6 is a longitudinal section of the assembled parts, excepting that theheadof the bolt is shown in elevation. Fig. 7 is a side view, and Fig. 8is a plan view of a wrench for use in removing the nut. Fig. 9 is a planview illustrating the use of the wrench of Figs. 7 and 8.

The nut 1, may be of usual construction, excepting that it has anundercut groove 2 made in its outer portion or face. This groove has itsbottom 8, smooth. The flange 4 need have only enough overhang over thegroove to prevent the escape of the dog 5. This dog 5 is of springmetal, with its ends 6 curved, the whole somewhat resembling anelongated 8, to engage the bottom of the groove and capable of beingfurther curved to release its hold on the bottom of the threadedgrooved, as at 9, to

Specification of Letters Patent. Patentgd Sept 15, 1914:,ApplicationfiledAugust 8, 1913.

Serial no. 783,751;

groove. The bolt 7 is provided with a longitudinal slit 8, which extendsthrough the shank only far enough to. allow the nut to be run on thefull length of the thread. The edges of this slit 8 may be permit freeplay of the dog.

When the bolt is in place, as in a railjoint, Fig. 1,the nut with thedog in it, is placed upon the endofthe bolt so that the dog will enterthe slit in the bolt, and then the nut is turned home. The ends of thedog are curved in the directionof rotation necessary toscrew on the nutand so offer no resistance to such placing of the nut. When, however,there is any effort made tending to release or remove the nut, the endsof the dog engage the bottom of the groove in the nut and tend tostraighten out and hence resist and prevent the escape of the nut. Bythis construction, no teeth or their equivalents need be used in or onthe nut. When it is desired to remove the nut, the ends of the dog arebent over in the direction of their curvature so as to release theirgrip on the nut, and then the nut may beturned oil. A suitable tool forthis purpose is shown in Figs. 7 8, and 9, the same consisting of ahandle 10, having the depending fingers 11 adapted to enter the groovedend of the nut and engage the ends of the dog as indicated in Fig. 9,and then by movement of the wrench in the direction of the arrow F 9,the dogs ends may be bent further in the direction of their curvature torelease them from engagement with the groove, and the nut then may berun ofi. This may be done without impairing the further usefulness ofeither the nut, bolt, or dog.

The invention is susceptible of modifications within the scope of theappended claims.

What I claim is 1. A nut-lock, comprising a longitudinally slit bolt, anut having an undercut groove in its outer portion or face, and a dogengaging the slit in the bolt and having its ends projecting outwardlybeyond the bolt andcurved in the direction of that rotation {of the nutnecessary to apply the nut to the bolt, said ends located in said grooveand engaging the bottom of said groove to resist the removal of the nut.

2. In a nut-lock, a nut having an undercut smooth bottomed groove in itsouter porthe groove and adapted to springinto frictional engagement withsaid smooth bottomand capable of being disengaged therefrom by furthercurvature in the same direction by means of an independent tool.

3. A nut-lock; comprising a longitudinally slit bolt, the edges of theslit being groove in the nut.

grooved, a nut provided Within its outer face With an undercut groove,and an 5 spring located in said groove and engaging the slit in theboltandthe bottom 'of the 15 In testimony whereof I have hereunto 'setmy hand this 8th day of August A. D. 1913. MAURICE AOKERMAN. Witnesses:WIS/DH. FINGIGEL SAMUEL Knuoorr.

Copies of thi's patent may be obtaine d' for five cents each, byaddressing the Qommi ss'ionerof Patents, Washington, I). C. T i l

